CSS not being hosted on CDN

Hi, my problem is my CSS isn’t being served from my CDN even though I *think* I’ve got it set up correctly (obviously not 🙂 though).

Site: http://www.squashsource.com/
“Host minified CSS and JS files” is checked

Please let me know if you need any more info.

Thank you.

https://wordpress.org/plugins/w3-total-cache/